[lttng-dev] [PATCH lttng-modules] Fix compilation on Linux kernel >= 3.18.0

[André Goddard Rosa]

Since kernel commit 8a9522d2fe compilation fails as kvm_age_page
tracepoint had its signature changed, so update it accordingly.

Tested pointing to kernels:
    git reset --hard v3.17; make init/version.o
    git reset --hard v3.18-rc1; make init/version.o

Signed-off-by: André Goddard Rosa <andre.goddard at gmail.com>
---
 instrumentation/events/lttng-module/kvm.h | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 mode change 100644 => 100755 instrumentation/events/lttng-module/kvm.h

diff --git a/instrumentation/events/lttng-module/kvm.h b/instrumentation/events/lttng-module/kvm.h
old mode 100644
new mode 100755
index c0d42e2..4f95095
--- a/instrumentation/events/lttng-module/kvm.h
+++ b/instrumentation/events/lttng-module/kvm.h
@@ -232,6 +232,34 @@ LTTNG_TRACEPOINT_EVENT(kvm_fpu,
 	TP_printk("%s", __print_symbolic(__entry->load, kvm_fpu_load_symbol))
 )
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,18,0))
+
+LTTNG_TRACEPOINT_EVENT(kvm_age_page,
+	TP_PROTO(ulong gfn, int level, struct kvm_memory_slot *slot, int ref),
+	TP_ARGS(gfn, level, slot, ref),
+
+	TP_STRUCT__entry(
+		__field(        u64,    hva             )
+		__field(        u64,    gfn             )
+		__field(        u8,     level           )
+		__field(        u8,     referenced      )
+	),
+
+	TP_fast_assign(
+		tp_assign(gfn, gfn)
+		tp_assign(level, level)
+		tp_assign(hva, ((gfn - slot->base_gfn) <<
+			PAGE_SHIFT) + slot->userspace_addr)
+		tp_assign(referenced, ref)
+	),
+
+	TP_printk("hva %llx gfn %llx level %u %s",
+		__entry->hva, __entry->gfn, __entry->level,
+		__entry->referenced ? "YOUNG" : "OLD")
+)
+
+#else
+
 LTTNG_TRACEPOINT_EVENT(kvm_age_page,
 	TP_PROTO(ulong hva, struct kvm_memory_slot *slot, int ref),
 	TP_ARGS(hva, slot, ref),
@@ -254,6 +282,7 @@ LTTNG_TRACEPOINT_EVENT(kvm_age_page,
 		  __entry->referenced ? "YOUNG" : "OLD")
 )
 #endif
+#endif
 
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,38))
 
-- 
2.1.3